Trzcinski A P, Stuckey D C
Department of Chemical Engineering and Chemical Technology, Imperial College of Science and Technology and Medicine, Prince Consort Road, London, UK.
Water Res. 2009 May;43(9):2449-62. doi: 10.1016/j.watres.2009.03.030. Epub 2009 Mar 26.
The stability and performance of a two-stage anaerobic membrane process was investigated at different organic loading rates (OLRs) and Hydraulic Retention Times (HRTs) over 200 days. The Hydrolytic Reactor (HR) was fed with the Organic Fraction of Municipal Solid Waste (OFMSW), while the leachate from the HR was fed continuously to two Submerged Anaerobic Membrane Bioreactors (SAMBR1 and 2). The Total COD (TCOD) of the leachate varied over a wide range, typically between 4000 and 26,000 mg/L while the Soluble COD (SCOD) in the permeate was in the range 400-600 mg/L, achieving a COD removal greater than 90% at a HRT of 1.6-2.3 days in SAMBR1. The operation was not sustainable below this HRT due to a membrane flux limitation at 0.5-0.8L/m(2) h (LMH), which was linked to the increasing MLTSS. SCOD in the recycled permeate did not build up indicating a slow degradation of recalcitrants over time. SAMBR2 was run in parallel with SAMBR1 but its permeate was treated aerobically in an Aerobic Membrane Bioreactor (AMBR). The AMBR acted as a COD-polishing and ammonia removal step. About 26% of the recalcitrant SCOD from SAMBR2 could be aerobically degraded in the AMBR. In addition, 97.7 % of the ammonia-nitrogen was converted to nitrate in the AMBR at a maximum nitrogen-loading rate of 0.18 kg NH(4)(+)-N/m(3) day. GC-MS analysis was performed on the reactor effluents to determine their composition and what compounds were recalcitrant.
在200多天的时间里，研究了两阶段厌氧膜工艺在不同有机负荷率（OLR）和水力停留时间（HRT）下的稳定性和性能。水解反应器（HR）采用城市固体废弃物有机组分（OFMSW）进料，而HR的渗滤液则连续进料至两个浸没式厌氧膜生物反应器（SAMBR1和2）。渗滤液的总化学需氧量（TCOD）变化范围很广，通常在4000至26000mg/L之间，而渗透液中的可溶性化学需氧量（SCOD）在400 - 600mg/L范围内，在SAMBR1中，当HRT为1.6 - 2.3天时，化学需氧量去除率大于90%。低于此HRT时，由于膜通量限制在0.5 - 0.8L/m²·h（LMH），且与混合液总悬浮固体（MLTSS）增加有关，运行无法持续。循环渗透液中的SCOD没有累积，表明难降解物质随时间缓慢降解。SAMBR2与SAMBR1并行运行，但其渗透液在好氧膜生物反应器（AMBR）中进行好氧处理。AMBR起到化学需氧量精处理和氨氮去除步骤的作用。SAMBR2中约26%的难降解SCOD可在AMBR中进行好氧降解。此外，在最大氮负荷率为0.18kg NH₄⁺-N/m³·天的条件下，AMBR中97.7%的氨氮转化为硝酸盐。对反应器出水进行了气相色谱 - 质谱（GC - MS）分析，以确定其组成以及哪些化合物是难降解的。
